To Be May 6 for WebbThe iHtempted-murdes* trial of William Larry Wehh. 20. accused of placing a package bomb In his father's mailbox, has been 'set for Mav 6 in Pinal County Superior Court. _ _• The trial is scheduled to begin at 9:30 a.m. before Judge T.J.Webb'is under indictment on charges of attempted murder and depositing an explosive with intent to injure.The package tomb, placed in the mailbox of Webb's father. Newell Webb 41. exploded on the afternoon of Jan. 22 as the eider Webb; began to unwrap the package inside his home at DesertYista north ol Casa Gnmde. . •,He was released from Good Samaritan Hospital in Pnoen.x.. after berth forearms were amputate! ■ • . .His son remains in custody in Pinal County tail m lieu of S2;s.noti^Mahoney earlier this month ruled that,the younger Webb is.able to stand trial and assist in his own defense. H.s ruling was based r^rvirt * of three psychiatrists who examined the suspect